CN103079260B - The D2D user power of fractional frequency reuse cellular cell controls and resource allocation methods - Google Patents

Abstract

The power that the invention discloses the multiplexing cellular uplink channel resource of D2D communication system in a kind of fractional frequency reuse cellular cell controls and channel resource allocation method, comprising: " the D2D communication channel resources in FFR cellular cell is distributed " and " the D2D communication system power in FFR cellular cell controls ".D2D communication channel resources in FFR cellular cell is distributed and is comprised: obtain D2D communicating pair phase mutual edge distance and phone user's transmitting power; Obtain region residing for accessible D2D user, namely D2D user can be accessed by district; Obtain being re-used region residing for honeycomb, can multipling channel resource-area.D2D communication system power in FFR cellular cell controls to comprise: judge that residing for D2D user, D2D user can be accessed by district; Judge D2D user's reusable channel resource district; Obtain in reusable channel resource district the phone user present position transmitting power that is re-used; Obtain D2D user emission power.

Description

The D2D user power of fractional frequency reuse cellular cell controls and resource allocation methods

Technical field

The present invention relates to the communications field, in particular under the cellular cell environment that fractional frequency reuse (FractionalFrequencyReuse, FFR) is disposed, power control and channel resource allocation method are carried out to the multiplexing cellular uplink channel resource of D2D (Device-to-Device) communication system.

Background technology

D2D(Device-to-Device is introduced in fractional frequency reuse cellular network) communication system can improve the availability of frequency spectrum, improves throughput of system, reduces user's energy ezpenditure.Under the multiplexing phone user's communication channel resource conditions of D2D communication system, the mutual interference between D2D communication system and cellular communication system can cause intercommunication Signal to Interference plus Noise Ratio (SINR) to decline, thus makes intercommunication Quality Down.

The channel resource allocation method introducing D2D communication system in the fractional frequency reuse cellular network provided in existing document proposes: when D2D user is in fractional frequency reuse cell center region, then edge, the neighbor cell channel resource that phone user uses is distributed for D2D user in base station; When D2D user is in fractional frequency reuse cell edge region, then the channel resource used is distributed this center of housing estate regional cellular user for D2D user in base station.

After analyzing existing method, find that document institute extracting method does not relate to the Power Control Problem of D2D user, power controls to disturb between coordination D2D system and cellular communication system to play great role; Document institute extracting method not can be accessed by district and recoverable resources district to D2D user and is optimized, and still may there is larger interference in some cases, especially under D2D user is positioned at cell edge region situation.

Summary of the invention

The D2D user power that the invention provides a kind of fractional frequency reuse cellular cell controls and resource allocation methods, can carry out power control and channel resource allocation by the method to D2D communication system.

The D2D user power of fractional frequency reuse cellular cell controls and a resource allocation methods, comprising:

(1) D2D communication system power controls:

Comprise large scale decline based on path loss and the supposition of obeys index distribution multipath fading according to communication channel, calculate the outage probability of phone user, according to default cellular communication SINR thresholding γ _cthand outage probability thresholding ε _cth, obtain the most high transmit power of D2D user;

(2) generating center D2D user can be accessed by district and reusable channel resource district:

(2.1) generating center D2D user can be accessed by district and reusable channel resource:

According to the lowest transmit power of this community or edge, neighbor cell phone user, and the SINR thresholding of center D2D user, outage probability thresholding and most high transmit power, calculate the distance d of center D2D user's transmitting terminal to this cell base station _acspan, be designated as set D _ac;

It is A that center D2D user can be accessed by district _cent={ d _ac| d _ac∈ D _ac, d _ac≤ R _th, R _thfor the radius of the central area of fractional frequency reuse cellular cell;

D2D user's reusable channel resource district, center is neighbor cell fringe region, is designated as B _cent, namely center D2D user reusable channel resource for neighbor cell arbitrarily not the channel resource that uses by the multiplexing edge phone user of this center of housing estate D2D user;

(2.2) generate edge D2D user and can be accessed by district and reusable channel resource:

According to this center of housing estate phone user transmitting power, and the SINR thresholding of edge D2D user, outage probability thresholding and most high transmit power, calculate the distance d of edge D2D user's transmitting terminal apart from this cell base station _aewith the distance d of phone user's distance base station that can be re-used _krelational expression, namely obtain edge D2D user and can be accessed by district A _edgewith reusable channel resource district B _edgerelation;

User presets d according to self-demand _aespan, namely edge D2D user can be accessed by district A _edge, or default d _kspan, i.e. edge D2D user reusable channel resource district B _edge, correspondingly obtain edge D2D user's reusable channel resource district B _edgeor edge D2D user can be accessed by district A _edge;

(3) D2D communication channel resources is distributed:

Obtain this cell base station of D2D user distance distance d to be accessed _d2d, judge d _d2d∈ { A _cent∪ A _edgewhether set up; As judged then D2D user to be accessed cannot multiplexing phone user's channel resource, and system is that it distributes special up or downlink cellular channel resource; As judged d _d2d∈ { A _cent∪ A _edge, judge d further _d2d∈ A _centwhether set up; Judge d _d2d∈ A _centset up, then D2D user to be accessed belongs to center D2D user, for it distributes B _centphone user's channel resource that Nei Weibeizhe community D2D user is multiplexing; Judge d _d2d∈ A _edgeset up, then D2D user to be accessed belongs to edge D2D user, for it distributes B _edgephone user's channel resource that Nei Weibeizhe community D2D user is multiplexing.

In step (1), the cellular communication SINR thresholding γ that described basis is preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power of D2D user, specifically comprise:

(1.1) obtain the distance of this cell base station of D2D user distance, judge whether D2D user is positioned at the central area of fractional frequency reuse cellular cell;

(1.2) if judge that D2D user is positioned at the central area of fractional frequency reuse cellular cell, then the lowest transmit power P of this community or edge, neighbor cell phone user is obtained _ke, according to the cellular communication SINR thresholding γ preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power P of D2D user _acmax; If judge that D2D user is positioned at the fringe region of fractional frequency reuse cellular cell, then obtain this center of housing estate and to be re-used the transmitting power P of phone user _kcand present position distance base station distance d _k, according to the cellular communication SINR thresholding γ preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power P of D2D user _aemax.

In step (2.1), generating center D2D user can be accessed by the lowest transmit power that district specifically comprises this community of acquisition or edge, neighbor cell phone user, and the SINR thresholding of center D2D user, outage probability thresholding and most high transmit power, obtain center D2D communication interruption probability expression formula; Be less than default outage probability threshold condition according to center D2D telex network outage probability, computer center D2D user can be accessed by district.

Step (2.2) middle generation edge D2D user can be accessed by district and specifically comprises this center of housing estate of acquisition phone user transmitting power, and the SINR thresholding of edge D2D user, outage probability thresholding and most high transmit power, obtain edge D2D telex network outage probability expression formula; According to edge D2D telex network outage probability restrictive condition, calculate edge D2D user and can be accessed by district A _edgewith reusable channel resource district B _edgerelation.

The D2D user power of fractional frequency reuse cellular cell provided by the invention controls and resource allocation methods is low complexity algorithm; Only obtain the distance of D2D transmitting terminal to be accessed distance base station, Resourse Distribute and the power that both can complete D2D communication link control; And only need perform when initialization is disposed in cellular cell or user redefines; Improve the availability of frequency spectrum; Improve throughput of system; Reduce user's energy ezpenditure.

Accompanying drawing explanation

Fig. 1 is that the power of D2D communication system multiplexing fractional frequency reuse phone user up channel in the present invention controls and channel resource allocation flow chart;

Fig. 2 is that the D2D user of generating fractional channeling cellular cell in the present invention can be accessed by district and reusable channel resource district flow chart;

Fig. 3 is that the D2D user resources of mid-score channeling cellular cell of the present invention are distributed and power control procedures figure;

Fig. 4 is the average SINR Cumulative Distribution Function of phone user in an embodiment provided by the invention;

Fig. 5 is the average SINR Cumulative Distribution Function of D2D user in an embodiment provided by the invention.

Embodiment

The invention provides and a kind ofly carry out power for the D2D communication system under fractional frequency reuse cellular cell and control the method with channel resource allocation, the method as shown in Figure 1, comprising:

S11, generation D2D user can be accessed by district and reusable channel resource district;

S12, obtain the distance d of this cell base station of D2D user distance to be accessed _d2d

S13, D2D user's transmitting terminal to be accessed of obtaining according to S11 are to the distance d of this cell base station _d2djudge d _d2d∈ { A _cent∪ A _edgewhether set up, namely whether D2D transmitting terminal to be accessed is in D2D user and can be accessed by district;

S14, S13 judge then this D2D user does not adopt multiplexing honeycomb channel resources mode, and base station is that it distributes special honeycomb channel resource and the power of this D2D user's transmitting terminal;

S15, S13 judge d _d2d∈ { A _cent∪ A _edge, then this D2D user adopts multiplexing honeycomb channel resources mode, and base station is that this D2D user distributes multiplexing honeycomb channel resource and transmitting power;

Wherein, S11 generates D2D user and can be accessed by district and reusable channel resource district and specifically comprise:

S111, acquisition neighbor cell or this cell edge phone user lowest transmit power P _keand the channel resource information used;

It is d that S112, note center D2D user can be accessed by a certain D2D transmitting terminal a in district to the distance of this cell base station _ac, obtain phone user's Signal to Interference plus Noise Ratio (SINR) the thresholding γ preset _cth, outage probability thresholding ε _cth; Need to be less than outage probability thresholding ε to the outage probability that the cellular communication link that is re-used causes according to D2D communication system _cthcondition, obtain this center D2D transmitting terminal maximum transmission power; Outage probability is defined as the SINR(that cellular communication link receiving terminal receives and is designated as γ _cent) be less than default Signal to Interference plus Noise Ratio thresholding γ _cthprobability, i.e. P _r(γ _cent≤ γ _cth)≤ε _cth; γ _centcan be expressed as:

${\mathrm{\γ}}_{\mathrm{cent}}=\frac{P_{\mathrm{ke}}{H}_{\mathrm{kB}}{R}^{-\mathrm{\α}}}{P_{\mathrm{ac}}{H}_{\mathrm{aB}}{d}_{\mathrm{aB}}^{-\mathrm{\α}}+N_0}$

Wherein, H _aB, H _kBrepresent the channel fading of D2D transmitting terminal a and phone user k to the user k place cell base station that is re-used respectively, obeys index distribution; d _aBrepresent D2D transmitting terminal a to user k place cell base station distance, also can be expressed as d _aB=2R-d _ac, wherein, R is cellular cell radius, d _acfor D2D transmitting terminal a is apart from the distance of this cell base station; α is path loss index; P _accentered by the transmitting power of D2D transmitting terminal a; N ₀for noise power;

Obtain center D2D user's transmitting terminal maximum transmission power P _acmaxfor:

$P_{\mathrm{ac}\max }=\frac{{\left({2R-d}_{\mathrm{ac}}\right)}^{\mathrm{\α}}{P}_{\mathrm{ke}}}{{\mathrm{\γ}}_{\mathrm{cth}}{R}^{\mathrm{\α}}}[\frac{1}{1-{\mathrm{\ϵ}}_{\mathrm{cth}}}\exp (-\frac{N_0{\mathrm{\γ}}_{\mathrm{cth}}{R}^{\mathrm{\α}}}{P_{\mathrm{ke}}})-1]---\left(0.1\right)$

Wherein, R is cellular cell radius;

Distance d between S113, acquisition D2D communicating pair _ab, preset SINR thresholding γ _dth, outage probability thresholding ε _dth; Affect by cellular communication system the outage probability caused according to D2D communication system and be less than default thresholding ε _dthcondition, the SINR(that namely D2D user's receiving terminal receives is designated as γ _rd2d) be less than default SINR thresholding γ _dthprobability be less than default outage probability thresholding ε _dth, P _r(γ _d2d≤ γ _dth)≤ε _dth, can d be obtained _acdemand fulfillment:

$\left\{\begin{array}{c}(1-{\mathrm{\ϵ}}_{\mathrm{dth}})(1+\frac{P_{\mathrm{ke}}{d}_{\mathrm{kb}}^{-\mathrm{\α}}}{P_{\mathrm{ac}\max }{d}_{\mathrm{ab}}^{-\mathrm{\α}}}{\mathrm{\γ}}_{\mathrm{dth}})\≤\exp [-\frac{{\mathrm{\γ}}_{\mathrm{dth}}}{\frac{P_{\mathrm{ac}\max }{d}_{\mathrm{ab}}^{-\mathrm{\α}}}{N_0}}]\\ d_{\mathrm{kb}}=R-d_{\mathrm{ac}}-d_{\mathrm{ab}}\end{array}\right.---\left(0.2\right)$

Wherein d _kbfor the phone user distance D2D receiving terminal beeline that is re-used;

The distance d of D2D transmitting terminal distance base station can be obtained according to formula (0.1) and formula (0.2) _acspan, be designated as set D _ac; Obtaining D2D user, to can be accessed by district be A _cent={ d _ac| d _ac∈ D _ac, d _ac≤ R _th;

Wherein, R _thfor the radius of the central area of fractional frequency reuse cellular cell.

? when, can d be solved _acspan be:

$A_{\mathrm{cent}}=\left\{d_{\mathrm{ac}}\right|0<d_{\mathrm{ac}}\&le;\min (2R-\frac{{R+d}_{\mathrm{ab}}+\sqrt{{(R+d_{\mathrm{ab}})}^2+4\mathrm{\&beta;}}}{2},R_{\mathrm{th}})---(0.3)$

Wherein, $\mathrm{\&beta;}={\left(\frac{(1-{\mathrm{\&epsiv;}}_{\mathrm{dth}})d_{\mathrm{ab}}^{\mathrm{\&alpha;}}{\mathrm{\&gamma;}}_{\mathrm{dth}}{\mathrm{\&gamma;}}_{\mathrm{dth}}{\mathrm{\&gamma;}}_{\mathrm{cth}}{R}^{\mathrm{\&alpha;}}}{\frac{{\mathrm{\&epsiv;}}_{\mathrm{dth}}}{1-{\mathrm{\&epsiv;}}_{\mathrm{cth}}}\exp [-\frac{N_0{\mathrm{\&gamma;}}_{\mathrm{cth}}{R}^{\mathrm{\&alpha;}}}{P_{\mathrm{ke}}}]-{\mathrm{\&epsiv;}}_{\mathrm{dth}}}\right)}^{\frac{1}{\mathrm{\&alpha;}}};$

S114, recoverable resources district are any fringe region in neighbor cell, and any phone user's channel resource namely in this region can be used alone by the user that center D2D user can be accessed by district, is designated as B _cent;

S115, obtain this center of housing estate phone user transmitting power P _kcand the channel resource information used;

It is d to this cell base station that S116, note edge D2D user can be accessed by a certain D2D user's transmitting terminal a in district _ae, obtain phone user's Signal to Interference plus Noise Ratio (SINR) the thresholding γ preset _cth, outage probability thresholding ε _cth, obtain in recoverable resources district and be re-used phone user apart from this cell base station d _k; Need to be less than thresholding ε to the outage probability that the cellular communication link that is re-used causes according to D2D communication system _cthcondition, obtain this edge D2D transmitting terminal maximum transmission power; Outage probability is defined as the SINR(that cellular communication link receiving terminal receives and is designated as γ _edge) be less than default thresholding γ _cthprobability, i.e. P _r(γ _edge≤ γ _cth)≤ε _cth; γ _edgecan be expressed as:

${\mathrm{\&gamma;}}_{\mathrm{edge}}=\frac{P_{\mathrm{kc}}{H}_{\mathrm{kB}}{d}_k^{-\mathrm{\&alpha;}}}{P_{\mathrm{ae}}{H}_{\mathrm{aB}}{d}_{\mathrm{ae}}^{-\mathrm{\&alpha;}}+N_0}$

Wherein, H _aB, H _kBrepresent D2D transmitting terminal a and the channel fading of phone user k to this cell base station that be re-used respectively, obeys index distribution; d _ae, d _krepresent that D2D transmitting terminal a and the phone user that is re-used are to this cell base station distance respectively; α is path loss index; P _aefor edge D2D transmitting terminal a transmitting power; P _kcfor apart from this cell base station distance be d _kthe lowest transmit power of phone user;

Obtain edge D2D user's transmitting terminal maximum transmission power P _aemaxfor:

$P_{\mathrm{ae}\max }=\frac{d_{\mathrm{ae}}^{\mathrm{\&alpha;}}{P}_{\mathrm{kc}}}{d_k^{\mathrm{\&alpha;}}{\mathrm{\&gamma;}}_{\mathrm{cth}}}[\frac{1}{1-{\mathrm{\&epsiv;}}_{\mathrm{cth}}}\exp (-\frac{N_0{\mathrm{\&gamma;}}_{\mathrm{cth}}{d}_k^{\mathrm{\&alpha;}}}{P_{\mathrm{kc}}})-1]---\left(0.4\right)$

Distance d between S117, acquisition D2D communicating pair _ab, preset SINR thresholding γ _dth, outage probability thresholding ε _dth; Affect by cellular communication system the outage probability caused according to D2D communication and be less than default thresholding ε _dthcondition, the SINR(that namely D2D receiving terminal receives is designated as γ _d2d) be less than default SINR thresholding γ _dthprobability be less than default outage probability thresholding ε _dth, P _r(γ _d2d≤ γ _dth)≤ε _dth, can d be obtained _aedemand fulfillment:

$\left\{\begin{array}{c}(1-{\mathrm{\&epsiv;}}_{\mathrm{dth}})(1+\frac{P_{\mathrm{ke}}{d}_{\mathrm{kb}}^{-\mathrm{\&alpha;}}}{P_{\mathrm{ae}\max }{d}_{\mathrm{ab}}^{-\mathrm{\&alpha;}}}{\mathrm{\&gamma;}}_{\mathrm{dth}})\&le;\exp [-\frac{{\mathrm{\&gamma;}}_{\mathrm{dth}}}{\frac{P_{\mathrm{ae}\max }{d}_{\mathrm{ab}}^{-\mathrm{\&alpha;}}}{N_0}}]\\ d_{\mathrm{kb}}=d_{\mathrm{ae}}-d_k-d_{\mathrm{ab}}\end{array}\right.---\left(0.5\right)$

Wherein d _kbfor the beeline of the phone user distance D2D receiving terminal that is re-used, d _kfor the phone user that is re-used is to this cell base station distance;

Solution formula (0.4) and formula (0.5) can obtain the distance d of D2D transmitting terminal to base station _aewith multiplexing phone user to this cell base station distance d _krelation, namely D2D user can be accessed by the relation in district and reusable cell resource district;

S118, the distance d of D2D transmitting terminal distance base station can be obtained by S117 _aewith multiplexing phone user to this cell base station distance d _krelation, user can arrange D2D user according to the actual requirements and can be accessed by district or recoverable resources district, i.e. d _aeor d _kvalue, correspondingly obtain recoverable resources district or D2D user can be accessed by district, be designated as A respectively _edgeand B _edge;

Wherein, S15 is that D2D to be accessed communication comprises allocation of channel resources and transmitting power:

S151, judge d _d2d∈ { A _cent∪ A _edge, then judge d further _d2d∈ A _centwhether set up;

S152, judge d _d2d∈ A _centset up, namely D2D communication to be accessed can be accessed by district to being in center D2D user, for it distributes reusable channel resource district set B _centin the channel resource that uses of the multiplexing phone user of any Wei Beizhe community D2D user;

S153, the multipling channel resource of distributing according to S152, for this D2D user distributes most high transmit power:

$P_{d2d}=\frac{{(2R-d_{d2d})}^{\mathrm{\&alpha;}}{P}_{\mathrm{ke}}}{{\mathrm{\&gamma;}}_{\mathrm{cth}}{R}^{\mathrm{\&alpha;}}}[\frac{1}{1-{\mathrm{\&epsiv;}}_{\mathrm{cth}}}\exp (-\frac{N_0{\mathrm{\&gamma;}}_{\mathrm{cth}}{R}^{\mathrm{\&alpha;}}}{P_{\mathrm{ke}}})-1]---\left(0.6\right)$

Wherein P _kefor adjacent cells or this Cell Edge User lowest transmit power;

S154, judge d _d2d∈ A _centbe false, i.e. d _d2d∈ A _edgeset up, D2D user to be accessed is in edge D2D user and can be accessed by region, for it distributes reusable channel resource district set B _edgein the channel resource that uses of the multiplexing phone user of Wei Beizhe community D2D user;

S155, the multipling channel resource of distributing according to S154, for this D2D user distributes most high transmit power:

$P_{d2d}=\frac{d_{d2d}^{\mathrm{\&alpha;}}{P}_{\mathrm{kre}}}{d_{\mathrm{kre}}^{\mathrm{\&alpha;}}{\mathrm{\&gamma;}}_{\mathrm{cth}}}[\frac{1}{1-{\mathrm{\&epsiv;}}_{\mathrm{cth}}}\exp (-\frac{N_0{\mathrm{\&gamma;}}_{\mathrm{cth}}{d}_{\mathrm{kre}}^{\mathrm{\&alpha;}}}{P_{\mathrm{kre}}})-1]---\left(0.7\right)$

Wherein P _kre, d _krebe respectively the transmitting power of the center cellular zone that this community is re-used and the distance of this cell base station of D2D user distance.

The principle that said method realizes and the technique effect reached can be:

The D2D user power of fractional frequency reuse cellular cell provided by the invention controls and resource allocation methods is low complexity algorithm; Only obtain the distance of D2D transmitting terminal to be accessed distance base station, Resourse Distribute and the power that both can complete D2D communication link control; And only need perform when initialization is disposed in cellular cell or user redefines; Improve the availability of frequency spectrum; Improve throughput of system; Reduce user's energy ezpenditure.

The invention provides the first embodiment, the technology scene that the present embodiment provides is, cellular cell radius R=500m, fractional frequency reuse line of demarcation radius R=300m, noise power N ₀=-121dBm, every center of housing estate region random distribution 30 center phone users and 12 pairs of D2D communication users pair, every cell edge region random distribution 20 center phone users and 8 pairs of D2D communication users pair, D2D communication is 35m to mutual ultimate range; Phone user SINR thresholding γ _cth=3dB, outage probability thresholding ε _cth=0.05; D2D user SINR thresholding γ _dth=3dB, outage probability thresholding ε _dth=0.05; Large scale fading paths loss index α=3.76, it is the exponential distribution of 1 that multipath fading obeys parameter;

Arranging D2D user's reusable channel resource district, center is neighbor cell fringe region; Edge D2D user is set and can be accessed by district for this cell edge region, i.e. d _ae=R _th;

Obtain the average SINR Cumulative Distribution Function of phone user as shown in Figure 3; Obtain the average SINR Cumulative Distribution Function of D2D user as shown in Figure 4.

Introduce the embodiment of the present invention above, apply specific case herein and set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, present disclosure content should not be construed as limitation of the present invention.

Claims (3)

1. the D2D user power of fractional frequency reuse cellular cell controls and a resource allocation methods, it is characterized in that, comprising:

(1) D2D communication system power controls:

Assuming that the large scale that communication channel gain comprises based on path loss declines and obeys index distribution multipath fading, calculate the outage probability of phone user according to communication channel gain, the Signal to Interference plus Noise Ratio (SINR) that outage probability is defined as receiving terminal Received signal strength is less than the probability of a certain pre-determined threshold; According to the cellular communication SINR thresholding γ preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power of D2D user;

(2) generate D2D user and can be accessed by district and reusable channel resource district:

(2.1) generating center D2D user can be accessed by district and reusable channel resource district:

According to the lowest transmit power of this community or edge, neighbor cell phone user, and the SINR thresholding of center D2D user, outage probability thresholding and most high transmit power, calculate the distance d of center D2D user's transmitting terminal to this cell base station _acspan, be designated as set D _ac;

It is A that center D2D user can be accessed by district _cent={ d _ac| d _ac∈ D _ac, d _ac≤ R _th, R _thfor the radius of the central area of fractional frequency reuse cellular cell;

D2D user's reusable channel resource district, center is neighbor cell fringe region, is designated as B _cent, i.e. the channel resource that uses for edge phone user that neighbor cell any Wei Beizhe community D2D user is multiplexing of center D2D user reusable channel resource;

(2.2) generate edge D2D user and can be accessed by district and reusable channel resource district:

According to this center of housing estate phone user transmitting power, and the SINR thresholding of edge D2D user, outage probability thresholding and most high transmit power, calculate the distance d of edge D2D user's transmitting terminal to this cell base station _aewith the distance d of phone user's distance base station that can be re-used _krelational expression, namely obtain edge D2D user and can be accessed by district A _edgewith reusable channel resource district B _edgerelation;

User presets d according to self-demand _aespan, namely edge D2D user can be accessed by district A _edge, or default d _kspan, i.e. edge D2D user reusable channel resource district B _edge, correspondingly obtain edge D2D user's reusable channel resource district B _edgeor edge D2D user can be accessed by district A _edge;

(3) D2D communication channel resources is distributed:

Obtain this cell base station of D2D user distance distance d to be accessed _d2d, judge d _d2d∈ { A _cent∪ A _edgewhether set up; As judged then D2D user to be accessed cannot multiplexing phone user's channel resource, and system distributes dedicated uplink or downlink cellular channel resource and power for it; As judged d _d2d∈ { A _cent∪ A _edge, judge d further _d2d∈ A _centwhether set up; Judge d _d2d∈ A _centset up, then D2D user to be accessed belongs to center D2D user, for it distributes B _centphone user's channel resource that Nei Weibeizhe community D2D user is multiplexing; Judge d _d2d∈ A _edgeset up, then D2D user to be accessed belongs to edge D2D user, for it distributes B _edgephone user's channel resource that Nei Weibeizhe community D2D user is multiplexing.

2. the D2D user power of fractional frequency reuse cellular cell according to claim 1 controls and resource allocation methods, it is characterized in that, in step (1), and the cellular communication SINR thresholding γ that described basis is preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power of D2D, specifically comprise:

(1.1) obtain the distance of this cell base station of D2D user distance, judge whether D2D user is positioned at the central area of fractional frequency reuse cellular cell;

(1.2) if judge that D2D user is positioned at the central area of fractional frequency reuse cellular cell, then the lowest transmit power P of this community or edge, neighbor cell phone user is obtained _ke, according to the cellular communication SINR thresholding γ preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power P of D2D user _acmax; If judge that D2D user is positioned at the fringe region of fractional frequency reuse cellular cell, then obtain this center of housing estate and to be re-used the transmitting power P of phone user _kcand present position distance base station distance d _k, according to the cellular communication SINR thresholding γ preset _cthand outage probability thresholding ε _cth, obtain the most high transmit power P of D2D user _aemax.

3. the D2D user power of fractional frequency reuse cellular cell according to claim 2 controls and resource allocation methods, it is characterized in that, the middle generating center D2D user of step (2.1) can be accessed by district and specifically comprises:

(1.1) lowest transmit power of this community or edge, neighbor cell phone user is obtained, and the SINR thresholding of center D2D user, outage probability thresholding and most high transmit power, calculate center D2D telex network outage probability expression formula;

(1.2) be less than default outage probability threshold condition according to center D2D telex network outage probability, calculate center D2D user and can be accessed by district.